well this was "interesting" for lack of a better word, disappointing is a more fitting word & given the cast we got here, will say that again - idk what the writer's/director were thinking - but this was a mess at parts & at others, just illogical b.s.
used to seeing incompetent cops that can't find their head with their own 2 hands, let alone shoot a gun when needed. but can/will lookover most of the glitches - even the plotholes until that whack end - like seriously?!?

Alpha the invincible machine was taken out, in that insiginificant way? why?!? why he the only test subject to get his eyes wired shut?!? how it go from japanese guys doing human experiments, to the test subject runing the show?!? just to make a antiaging drug? and if that wasn't enough, we got that rotten cherry on top (finding out Lee Do Il's son survived) but he being kept locked-up - why? why that CEO keeping the successful experiments confined, to what end?!? and as Lee Do Il doesn't know this fact, why we got this reveal?!? so "they" can make a part 2 - to this mess?!? (ノへ￣、) plz...

pity, this had potential. it was ridiculous with the water-slide of blood used in every kill, let alone the cruelty at how each kill was implemented - overkill IMHO - just revolting (get it, they were bad-guy, still just nauseating). or those exaggerated foot falls of Alpha ¯\_(ツ)_/¯(like plz) so much could've/should've been cut short, so we get more of a story to the main plot. ironically or not the only one i rooted for (even before he came on scene) was Alpha. the rest were meeh (also the one i wanted dead from the start was the nurse (¬‿¬) OMG she got under my skin, i applauded her kill).
anyway like i wrote above, this plot needed to be rewritten, with a clear end & some answers about the main charecter's/plot, that would be appreciated (let alone make this a good movie), as is - it was fine for a 1 off. but still a bummer